docs: Move WiPy specific Timer class to separate doc file.

The WiPy machine.Timer class is very different to the esp8266 and esp32
implementations which are better candidates for a general Timer class.  By
moving the WiPy Timer docs to a completely separate file, under a new name
machine.TimerWiPy, it gives a clean slate to define and write the docs for
a better, general machine.Timer class.  This is with the aim of eventually
providing documentation that does not have conditional parts to it,
conditional on the port.

While the new docs are being defined it makes sense to keep the WiPy docs,
since they describe its behaviour.  Once the new Timer behaviour is defined
the WiPy code can be changed to match it, and then the TimerWiPy docs would
be removed.

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